Download Muscular System lesson 3

Muscular System
Lesson Objectives
In today’s lesson you will:
• Can I re-cap last lessons keywords?
• Can I understand the short and long-term
effects of the muscular system when
participating in exercise? (C)
• Can I evaluate the importance of rest and
recovery? (A)
Starter – Mark Homework
1. C - Pectorals
2. C – Deltoids
3. A. A – Isotonic
B. C – isometric
4. Flexed
Bicep
5. Quadriceps
6. (i) Gastrocnemius
(ii) Hamstrings/Quadriceps
7. Antagonistically
1. When a rounder’s
player is holding a bat
ready to hit the ball the
elbow is flexed, what
muscle is contracting?
What muscle is relaxing?
(2 marks)
2. Which muscles contract
to allow flexion and
extension at the knee
joint? (2 marks)
Recap Questions
1.In swimming front crawl, what movements occur at
the hips? (2 marks)
2.In breast stroke what movements occur at the hips?
(2 marks)
3.Stretch your arm straight out palm up. Turn your
palm over. What movement occurred? (1 mark)
4.Show examples of: abduction, adduction, rotation,
flexion and extension. (5 marks)
Recap on Contractions
•
•
•
•
Isotonic – when movement occurs
Isometric – without movement
Concentric – shortens (clouds)
Eccentric- lengthens (elastic)
What type of muscle contraction is occurring when a weight lifter is
lifting a weight? (1 mark)
What types of muscle contraction is occurring when a gymnast is
holding a handstand? (1 mark)
What types of muscle contraction is occurring on the bicep when
the elbow flexes? (1 mark)
Video
• http://www.youtube.com/watch?v=aE8HyN0z
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Effects of Exercise
• The body combines glycogen and oxygen in the
working muscles to make energy.
• When we increase the intensity of exercise, we
need to increase the supply of oxygen.
• When we take part in physical activity – our body
experiences some immediate effects.
• These effects help the body so that the body can
complete the work that you want it to do
• What are these affects?
Effects of Exercise
Increased demand for energy
Increased temperature
Immediate
Effects
Increased heart
rate
Waste product (Lactic
Acid) is produced
Muscle fatigue
Perspire
Increased carbon
dioxide production
Effects of Exercise
• If you continue to exercise on a regular basis,
your body will start to adapt
• You become fitter because your body adapts to
make the work easier for your body to do
• Muscles improve their ability to produce energy
• Blood Vessels in the muscles become
more efficient so that they can cope with the
process better
• What other adaptations are there?
Effects of Exercise
Increased strength
of ligaments
Increased strength of
skeletal muscle
Increased strength of
tendons
Long term
effects
Increased mitochondria
(site of aerobic respiration)
Increased size of
skeletal muscle
(Hypertrophy)
Increased Myoglobin
(oxygen store)
Resting
• When you train muscles using the principle of
progressive overload, the tiny muscle Fibres are
pulled apart.
• The body repairs these damages when we rest
and build the Fibres back slightly stronger.
• The muscular system needs time to recover
before working again
• However if you stop training then muscles reduce
in size again through the principle of
reversibility. This is called Muscular Atrophy
Plenary
Quiz
Split Class in half
Team Names?
Team Buzzer
Must be somebody different answering the
question each time
??????????????????????????
Homework
For your sport:
Explain all the muscles you use and why you use
them.
Explain how you can train these specific muscles
and how by training them can improve your
sports performance